If you're not 100% completely satisfied, then just arrange to send it back within the return period:) If you have an LS engine, then please be aware that you may need adapters (metric to nonmetric) for our sending units. You may have to obtain them elsewhere separately, though they may have been included with your engine kit, so you may already have them. Also, if your LS engine is 4 cylinder, then please send a note to seller letting us know, so that we can set the tachometer accordingly. The tachometer is programmable, you can set it yourself if it comes set differently. Spruce up your great vehicle with an Intellitronix dash panel today! If you send an eBay message, then please be aware that we generally work M-F 8 a.m. - 5 p.m. and it may take 2 business days or more to respond. Please be patient as we answer questions in the order in which they are received. Please read the listing carefully. Also, we do not know your specific individual vehicle, so you will need to consult a dealer or service manual for questions about your specific individual vehicle. For shipping information, eBay lists tracking information automatically, so we cannot tell you any more than the order page will display automatically anyway, so please do not ask shipping questions unless your order has not shipped as agreed, which should not happen because we ship as agreed with eBay. For example, if you order a 3 business days handling time item on the weekend, it counts as a Monday order, which means it must ship by Thursday (the third business day after the day the order was placed) at midnight, according to eBay; please do not message us on Tuesday asking where your item is when it is not scheduled to ship until Thursday, something you agreed to when you ordered the item. For technical matters, you should contact the manufacturer's technical support department directly, as we will just refer you to them anyway, so asking us technical questions is not a good use of your or our time. More info can also be found at the Intellitronix website. Visit Our Store at http://stores.ebay.com/digitalgauge THIS PRODUCT COMES WITH A LIFETIME WARRANTY! ** WE DO NOT COVER THE COSTS OF LABOR PAID TO INSTALL THIS ITEM. **